NEOBANK ENGINEERING FOR FINTECH

Hiring Neobank Developers for Your Fintech

Just like generalist developers can’t necessarily do fintech work, not all fintech developers are able to build a neobank app.

A production neobank runs as a real-time financial system that processes payments, routes transactions across card networks and payment rails, performs KYC verification, monitors AML activity, and reconciles ledger entries across multiple providers.

Most developers can handle frontend delivery as long as they have some fintech experience and understand the user base.

The back end is a little more complex and involves things like BaaS integration, payment orchestration, KYC/AML workflows, and compliance-driven ledger design.

If you need to connect with skilled neobank developers today, request talent!

What Makes a Neobank Developer Different

Neobank engineering typically falls into three layers:

1. Product and UX Engineering

The process of product and user experience engineering in a neobank is very similar to that of any other mobile app built with React Native or Flutter.

Your developers need to decide what the path forward will be on things like onboarding flows, account management, transaction history, and notifications.

Most fintech developers will probably be able to do quite well in this section, and the regulatory exposure is generally quite low.

2. Payment and BaaS Integration

This second layer is usually where people run into issues. Think of this as your technical core.

Specialized, neobank developers will need to go through the process of integrating with BaaS providers (Unit, Column, Treasury Prime, Stripe Treasury), implementing payment rails (ACH, including returns and reversals, RTP, wire transfers, debit card networks, SEPA, FPS), and orchestrating systems across sponsor banks, card processors, and KYC vendors.

Developers need real-world experience here, as this is usually where edge cases are going to affect your performance.

3. Compliance-Embedded Engineering

While this is listed as the final layer, the truth is that compliance considerations need to be built into your application from the ground up.

Audit logging with immutable event trails, AML transaction monitoring thresholds, sanctions screening (OFAC), and KYC state machine design all sit here.

This includes handling:

• Partial identity verification states
• Document rejection and retry flows
• Account restrictions during AML review
• Audit logs required for regulatory examinations

The regulations that you are going to be subject to will depend on your region, as well as the region in which you offer your services, so you’ll need to think ahead to account for potential regional scaling early on.

For EU markets, GDPR data handling and PSD2 open banking requirements are going to be your biggest considerations.

Neobank Tech Stack

In order to complete the above-mentioned parts of the neobank successfully, there are several tools that developers need to be familiar with.

Core Banking and Ledger

Java, Kotlin, or Go typically power core banking services due to concurrency and latency requirements.

PostgreSQL supports double-entry ledger design with immutable audit trails, often implemented with event sourcing patterns.

Microservices architecture separates accounts, transactions, cards, KYC, and notifications, allowing independent scaling and failure isolation.

BaaS and Payment Integration

Unless you are going to be getting banking licences of your own, you will probably end up using BaaS (Banking-as-a-Service).

Developers will integrate your app with BaaS platforms such as Unit, Column, or Stripe Treasury, while working directly with payment rails like ACH (NACHA formatting, returns, reversals), RTP, FedNow, SWIFT, SEPA, and FPS.

On top of that, webhook-driven architectures manage asynchronous transaction states. Missed or duplicated webhook events can create reconciliation issues that require manual intervention.

KYC/AML and Compliance

Similarly, you will probably need to integrate with identity providers (Onfido, Persona, Socure, Veriff) that support KYC and KYB workflows.

Developers who play a role in your AML systems will need to implement threshold configuration, transaction monitoring, and sanctions screening.

This layer increasingly overlaps with fraud detection systems, including behavioral analytics and real-time anomaly detection.

Mobile and Frontend

React Native or Flutter dominate for cross-platform apps, and neobanks are no different.

General mobile app security tools like those related to biometric authentication (Face ID, Touch ID, FIDO2/passkeys) and OAuth 2.0 are also essential to support secure access.

Cloud and Infrastructure

AWS, GCP, or Azure environments host microservices on Kubernetes.

Experienced devs will also use Kafka or similar systems to handle real-time event streaming.

PCI DSS scope management, encryption (at rest and in transit), and VPC isolation define the baseline for handling financial data securely.

Neobank Engineering Roles and What You Actually Need for an MVP

For a BaaS-based MVP, you only need a couple of developers. It can be tempting to bring more people onto your team, but with more people involved, decisions take a lot longer to make. A small, well-balanced team is the way to go.

Here are the specifics of what you need, and how many:

• Backend Engineers (2–3): Own BaaS integration, payment orchestration, ledger logic, ACH processing, and webhook handling.
• Mobile Engineers (1–2): Build onboarding flows with KYC integration, account interfaces, and real-time transaction updates.
• Compliance Engineer (1): Designs KYC state machines, AML monitoring logic, audit logging, and sanctions screening. Often overlooked, but critical for regulatory readiness.
• DevOps/Cloud Engineer (1): Manages infrastructure, CI/CD pipelines, Kubernetes, and PCI DSS scope enforcement.

As the product scales, you can definitely benefit from adding on some ML/data engineers for fraud detection, security engineers, and backend specialists for new financial products such as lending or multi-currency accounts.

Hiring Models (What Actually Works)

The three main hiring models that people consider are in-house hiring, going through agencies for full builds (like in outsourcing), and then staff augmentation.

In-house hiring fits long-term leadership roles, but senior neobank engineers with BaaS and payment rail experience often take 4–6 months to hire.

You also need to have some technical knowledge to assess them, or you drastically increase your risk of hiring the wrong person and having to start the process all over again.

Agencies can work if you have well-defined builds. But neobank development introduces ongoing compliance decisions, including AML thresholds and dispute handling, that generic teams may miss.

Generally, making changes to your requirements will incur additional costs.

Staff augmentation works well when you already have a couple of developers, so the technical leadership exists.

Engineers with prior experience in ACH processing, card issuance, and KYC workflows are definitely the way to go here, as they already understand the industry, so they typically ramp faster and reduce production risk.

Cost Overview

The specialized skillset required by a neobank developer means that they can be quite expensive. Hiring from nearshore locations is a great way to decrease costs without necessarily sacrificing quality.

Here is what you can expect if you hire an in-house neobank specialist in the United States:

• Senior neobank backend engineer (US): $145k–$185k base
• Fully loaded cost: ~$195k–$250k
• Hiring timeline: typically 4–6 months

When you hire neobank developers from nearshore locations like Brazil through Trio, you pay between $40 and $90, depending on the specific position you are trying to fill.

Conclusion

Neobank developers require a unique skillset in order to build a secure and compliant product. The biggest mistake teams make involves hiring general fintech developers and discovering the gaps during production.

When you partner with Trio, you get developers with real-world experience who not only understand industry requirements but have also seen edge cases firsthand.

To see if we have the right developers for you, book a discovery call.